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Proceedings Paper

Intra-fiber mode combining schemes, demonstrating high power brightness preservation and coherent-coupling brightness enhancement
Author(s): Yariv Shamir; Roey Zuitlin; Yaakov Glick; Matitya Aviel; Noam Shafir; Revital Feldman; Asaf Dahan; Benayahu Urbach; Daniel Levy; Eyal Shekel; Yoav Sintov
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Paper Abstract

We demonstrate intra-fiber couplers performance that is close to complete brightness preservation up to 3kW. Furthermore, when mutually coherent sources were used, the same couplers were able to achieve brightness enhancement with almost no beam quality (BQ) deterioration. The couplers are based on an adiabatic, all-fiber, mode coupling device preserving the lowest spatial mode orders. Brightness levels that approach the theoretical limits were achieved by compressing the participating modes into a tight cross section. Incoherent combination is shown for 2×1, 3×1 and 7×1 combined elements. Additionally, we present a solution for preserving the beam propagation factor of the coupler by using a specialty engineered core delivery fiber. The fabricated components are fully fiber- integrated, hence, without free-space limitations. An overall transmission of <90% was obtained, while the coupler-delivery connection is responsible for less than 0.5% loss. Consequently, relatively low temperatures were observed in the combiner package. Alternatively, utilizing two mutually coherent sources, a quadratic brightness factor improvement was demonstrated. The scheme does not require polarization preserving fibers, and achieved rugged 'in-phase' mode-locking. This allows for a significantly simplified scheme, compared to common coherent combining methods. Prospect on future trends relating to nonlinearities and thermal load management are discussed.

Paper Details

Date Published: 20 February 2014
PDF: 10 pages
Proc. SPIE 8963, High-Power Laser Materials Processing: Lasers, Beam Delivery, Diagnostics, and Applications III, 89630H (20 February 2014);
Show Author Affiliations
Yariv Shamir, Soreq Nuclear Research Ctr. (Israel)
Roey Zuitlin, Soreq Nuclear Research Ctr. (Israel)
Yaakov Glick, Soreq Nuclear Research Ctr. (Israel)
Matitya Aviel, Soreq Nuclear Research Ctr. (Israel)
Noam Shafir, Soreq Nuclear Research Ctr. (Israel)
Revital Feldman, Soreq Nuclear Research Ctr. (Israel)
Asaf Dahan, Soreq Nuclear Research Ctr. (Israel)
Benayahu Urbach, Civan Advanced Technologies Ltd. (Israel)
Daniel Levy, Civan Advanced Technologies Ltd. (Israel)
Eyal Shekel, Civan Advanced Technologies Ltd. (Israel)
Yoav Sintov, Soreq Nuclear Research Ctr. (Israel)

Published in SPIE Proceedings Vol. 8963:
High-Power Laser Materials Processing: Lasers, Beam Delivery, Diagnostics, and Applications III
Friedhelm Dorsch, Editor(s)

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